Weft yarn inserting gripper

ABSTRACT

An inserting gripper for weft yarn comprising a body having a sliding surface and a rib extending normally thereto along the length of the body. A spur is located on the body and the body is provided with a flat spring arranged to cooperate with the spur for receiving and holding the yarn. The flat spring has a longitudinal recess which is adapted to receive the rib to which it is fastened.

0 United States Patent [151 3,638,635

Svaty 1 Feb. 1, 1972 [54] WEFT YARN INSERTING GRIPPER [56] References Cited [72] lnventor: Vladimir Svaty, Liberec, Czechoslovakia UNITED STATES PATENTS 1 Assigneel EliteX-Zavody Textilniho stmiirenstvi 2,090,703 8/1937 Rossmann .139/125 generalni reditelstvi, Liberec, 3,310,072 3/l967 Strobl Czechoslovakia Primary Examiner-Henry S. .laudon [22] Flled' 1970 Attorney-Richard Low and Murray Schaffer [2]] Appl. No.: 3l,l23

[57] ABSTRACT [30] Foreign Application Priority Data An inserting gripper for weft yarn comprising a body having a sliding surface and a rib extending normally thereto along the Apr. 30, I969 Czechoslovakia .3053 length of the body A Spur is located on he body and the body is provided with a flat spring arranged to cooperate with the [52] US. Cl ..13 9/125 spur for receiving and holding the yam The flat Spring has a [51] "D033 5/06 longitudinal recess which is adapted to receive the rib to [58] Field of Search l 39/122-127, 196, which it is fastened 5 Claims, 9 Drawing Figures PATENTEU FEB H972 $638385 6 6" INVENTOR L VLADIMIR SVATY ORN WEFT YARN INSERTING GRIIPER The present invention relates to a weft yarn inserting gripper, which upon moving through the shed is guided by a system of guiding combs and reeds dents to grip the weft yarn, the gripper is equipped with a spur mounted to the inner side of which is a flat spring.

Known types of inserting grippers, particularly those with a gripping mechanism on only one side, consist usually of a hollow body, in the interior of which at least one resilient means is fastened which, either directly or indirectly, by means of a lever or similar means controlled therefrom, grips the weft yarn during movement of the inserting gripper. The weft yarn having been previous to the picking introduced into the gripping mechanism by means of an introducing needle provided with or without further opening means.

The resilient means, such as flat springs, are fastened in the hollow of the inserting gripper either by fastening means, e.g., rivets or screws, or they are inserted into the hollow in a prestressed state, where they press against the walls of said hollow, thus being held substantially by friction.

The known inserting gripper with one flat spring has a stationary spur at the end of the hollow body. The flat spring bears against the inner side of said spur so that they constitute together the gripping mechanism. The inserting gripper of this h type, is guided through the shed by a system of guiding combs, which are arranged on the batten and the reed dents about which said gripper slides with its sliding surface. In the system of guiding combs, the inserting gripper is guided by its rib which is arranged on the hollow body. The said rib serves also as a buffer when ejecting or, respectively braking said inserting gripper.

Different textile materials place different requirements on the inserting gripper, particularly with respect to its weight and its need of surface lubrication, and similar properties. With the reduction in weight of the inserting gripper arising out of improvement in weaving looms, the force necessary for its acceleration and braking is also reduced.

The inserting grippers known at present do not fulfill the above requirements for versatility and force reduction. Moreover, the exchange or replacement of the resilient means inside the hollow of the inserting gripper is difficult, if not impossible.

The disadvantages are removed according to the present invention, which provides that the resilient means is provided with at least one longitudinal recess, through which passes the rib of the carrying means, said rib being equipped with fastening means for holding resilient means.

A particularly advantageous construction of the inserting gripper, which constitutes an easily obtainable and simultaneously light and firm construction, resides in the fact that the carrying means can be, according to this invention, bound together with the inserted rib by plastic material which constitutes the sliding surface which may also be provided with a tipped part.

By using simple parts the inserting gripper can be made easily and with great reliability. The spur is formed according to the present invention by a bend in the edge on the carrying means.

To stabilize the inserting gripper and to provide resistance against various impacts and vibrations, to which said inserter is exposed in the course of its movement through the shed, the carrying means is arranged in an inclined position with respect to the rib, the sliding surface being lightened at the point of the said carrying means.

Further advantages and features of the present invention are shown in the specification given below and in the accompanying drawings, ofwhich FIG. 1 represents the inserting gripper in its overall arrangement;

FIG. 2 the inserting gripper in plan view, in which the fastening means for a flat spring are shown;

FIG. 3 the guideway of the inserting gripper between the reed dents and the system ofguiding combs;

FIG. 4 an alternative embodiment of the inserting gripper, the base of which is constituted by the carrying means and the rib, mutually bound by plastic material constituting the sliding surface with a tipped part;

FIG. 5 a plan view of the inserting gripper as shown in FIG. 4 in partial section;

FIG. 6 the rib itself with the bilateral shallow recess for inserting the carrying part;

FIG. 7 the carrying part inserted into the recess in the rib and provided with a spur, said carrying part being provided with a recess, by which it is slided on to the recess in the rib as shown in FIG. 6;

FIG. 8 a profile of the rib, in which the bilateral shallow recess is shown;

FIG. 9 the profile of the carrying means together with the arrangement of the spur.

The inserting gripper is guided during its movement on one hand by the dents l of the reed, against which said gripper body slides with its sliding surface 2 and on the other hand by a system ofguiding combs 3, which are arranged on batten 4.

The inserting gripper is provided with a rib S, which, in addition to riding in the guideway of the comb 3 serves as a buffer during ejecting or braking said inserting gripper.

The basic parts of the inserting gripper are a body formed of a sliding surface 2, similar to a ski surface and of a rib 5. The body is arranged according to the present invention in the shape ofletter T, as shown in FIG. 3.

The sliding surface 2 of the inserting gripper is tipped on one of its ends and provided on its other end with a spur 6, about the inner side of which bears a resilient means 7 constituted by a flat spring which is provided with at least one longitudinal recess 8. Rib 5 passes through the said longitudinal recess 8, and is provided with fastening means 9, in the form of various wedges or similar elements to retain it.

The said fastening means 9 are suitably distributed on rib 5 to achieve the necessary prestressing of the flat spring 7. The spring bears securely against a spur 6 so that a weft yarn (not shown) can be gripped.

For weaving some very fine synthetic fibers, it is advantageous to replace the sliding surface 2 of the inserting gripper with a material which does not require any surface lubrication. Such a material can be, for example, plastic material with a low coefficient of friction, such as nylon.

By using plastic material, the construction of the inserting gripper is substantially simplified andmade lighter in weight by fastening the resilient means 7 on the outer side of the inserting gripper.

The basic parts of the inserting gripper are then a planar carrier body 10, which is provided with an inclined bilateral shallow recess 11, on which rib 5 is slided by means of its recess I2. The two parts 5, 10 are connected by spraying plastic material about them, which not only firmly connects the two elements, by partiallysurrounding them, but forms simultaneously a sliding surface 2 for even safer passage of the inserting gripper through the shed the surface 2 is provided with a tipped part 13.

It is advantageous to arrange the carrying means 10 in an inclined position with respectto the rib 5, so that at the point of the carrying means 10 the mass of the sliding-surface 2 will be smaller, i.e., the inserting gripper is lightened at that point (FIG. 5), whereupon themass of the sliding surface 2 at the tipped part 13 can be heavier.

If inserting gripper is provided at its tipped part 13 with a thicker layer of plastic material it can better resist the various impacts and influences to which it is exposed during passing through the shed, as the thicker layer will be able to better damp vibrations and other unfavorable oscillations.

By the inciined arrangement of thecarrying means 10, and the simultaneous lightening of the sliding surface .2, a free space is formed which simplifies theinsertion of the weft yarn, which is inserted into the gapformed by pressing away the flat spring 7 from the spur 6.

The spur 6 against which bears the said flat spring is formed by bending up the edge of the planar carrying means 10. It can be formed also in many other ways, including bending another suitable edge from above or from two sides or in any similar manner, or by fastening another suitable element on the carrying means 10, respectively.

The carrying means 10 can in the case of necessity extend as far as the tipped part 13 of the sliding surface 2 and thus constitute a perfect reinforcement for the device.

I claim:

1. An inserting gripper for weft yarn adapted to move through a shed guided by a system of guiding combs and reed dents comprising a body having a sliding surface on one face, a spur located on said body, and a flat spring arranged to cooperate with said spur to receive and hold said yarn, said spring having at least one longitudinal recess to receive said rib and fastening means for securing said rib and spring together.

2. The gripper according to claim 1 wherein said surface is formed of plastic material having a low coefficient of friction. said material being integrally formed to cover said body and said rib to secure the same together.

3. The gripper according to claim I wherein said body comprises a planar member and said spur is formed therefrom by bending an edge thereof out of the plane of the member.

4. The gripper according to claim 1 wherein said rib has an edge adapted to slide against said guiding comb and said body is planar, said body being arranged at an incline to the edge of said rib and said body having a tipped forward edge, said spur being located at the rear edge, the rear edge of said body being lightened so as to shift the center of gravity toward said tipped end.

5. The gripper according to claim 4 wherein said tipped end is reinforced to absorb shock. 

1. An inserting gripper for weft yarn adapted to move through a shed guided by a system of guiding combs and reed dents comprising a body having a sliding surface on one face, a spur located on said body, and a flat spring arranged to cooperate with said spur to receive and hold said yarn, said spring having at least one longitudinal recess to receive said rib and fastening means for securing said rib and spring together.
 2. The gripper according to claim 1 wherein said surface is formed of plastic material having a low coefficient of friction, said material being integrally formed to cover said body and said rib to secure the same together.
 3. The gripper according to claim 1 wherein said body comprises a planar member and said spur is formed therefrom by bending an edge thereof out of the plane of the member.
 4. The gripper according to claim 1 wherein said rib has an edge adapted to slide against said guiding comb and said body is planar, said body being arranged at an incline to the edge of said rib and said body having a tipped forward edge, said spur being located at the rear edge, the rear edge of said body being lightened so as to shift the center of gravity toward said tipped end.
 5. The gripper according to claim 4 wherein said tipped end is reinforced to absorb shock. 